* Astronomy

The "Cowell structure" in northern California is a possible 1.3 km wide buried impact crater dating to the Miocene (5 to 24 million years ago).

Source: Blake R. G., 1998. AAPG Bull. 82 (5A), 842.

Title: 3D Seismic and the Discovery of California's First Meteorite Impact Crater, Sacramento Valley
Authors: Blake, Richard G.

The first meteorite crater ever found in California was discovered as a buried feature in the Sacramento Valley, about seven miles southwest of the City of Sacramento. The crater is about 4300 feet in diameter and lies 2500 feet below ground surface. It was located using a 3D seismic survey intended for natural gas exploration. The crater has been formally named the Cowell Crater, after the S. H. Cowell Foundation which owns the property where the discovery was made.
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Latitude:  38°28'5.48"N, Longitude:  121°37'38.99"W
(Rough location)